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प्रश्न
Answer the following in detail.
Define friction and explain how it is useful to us.
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उत्तर
Friction is a force that opposes relative motion between two bodies/surfaces in contact with each other. Although friction opposes the motion, it also makes motion possible.
Friction helps us do many things like :
- It helps us in walking. In the absence of friction, we may slip or M.
- Cars and buses are able to move safely on roads due to the friction between the treaded tires of these vehicles and the surface of the road.
- Friction allows us to hold objects with our hands.
- It allows us to write on paper.
- Friction produces heat. In winter, when we rub our cold hands, the heat produced due to friction makes our hands warm.
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संबंधित प्रश्न
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Write true or false.
The sliding friction is more than the rolling friction.
Name the three kinds of friction.
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Give three examples to illustrate that friction is a necessary evil.
Define static friction
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Tick the most appropriate answer.
Friction produces
Answer the following in detail.
Describe three different ways by which friction can be increased to help us in various situations?
Analogy
Objects placed at rest on earth: ______:: Bodies slide over the surface on other body: ______.
